There is a small possibility that you lost it during a bowel movement. I advise that it should be checked for placement every day during your daily shower or whatever and also after sex, if you leave it in for intercourse. The ring may become dislodged during intercourse so you should check for placement after intercourse. Some women prefer to remove it for intercourse but it should be out no longer than 3 hours and one has to remember to rinse it with warm clean water and replace it again before the 3 hours is up. Many men are not familiar with what NuvaRing looks like and may not know what it is if it dislodges during intercourse so it is best if you check for it after intercourse yourself, if you leave it in for intercourse. Did you have any bleeding during this time? At this point, you may want to wait for your period and just start over. Be sure to use condoms until the ring has been in place for seven days.